Thanks for reporting this issue. I believe you're seeing a Virtualbox bug (https://www.virtualbox.org/ticket/15317), rather than an Ubuntu Vagrant box issue.
We fixed this bug in the version of Virtualbox that shipped in xenial[0], but upstream have not yet released a patched version.
Hi Marvin,
Thanks for reporting this issue. I believe you're seeing a Virtualbox bug (https:/ /www.virtualbox .org/ticket/ 15317), rather than an Ubuntu Vagrant box issue.
We fixed this bug in the version of Virtualbox that shipped in xenial[0], but upstream have not yet released a patched version.
Thanks,
Dan
[0] https:/ /launchpad. net/ubuntu/ +source/ virtualbox/ 5.0.18- dfsg-2build1